Here is the battle schematic I showed before with two slight modifications:
The terminator squad can wheel about to extend their firing range and launch assaults. My squad has a large number of halberds so it is almost always advantageous to charge for the +1A bonus. Any enemy units that come into the nexus have little chance of survival - think of free wheeling as a trap.
Most often I like to keep Draigo and his retinue out of close combat as long as possible. By leaving a gap behind the landraider and the table edge they can safely redirect while still cut off completely from enemy LOS. This is important as you want to keep them safe from any enemy shooting that can insta gib them. If you can keep them outside of the landraider then they can lend the strength of their stormbolters which can be very helpful.
The Roman Legions used very simple tactics to crush their enemies over the course of several centuries. Draigowing is similar in that it is slow, compact and very powerful. There are not many other armies that can shift them.